. >> and when they went and looked at who signed for the car to be rented, luis rivera and sigfredo garciaened criminal. >> more hardened criminal, involved in a lot of gang activity. >> luis was an acknowledged member of the latin kings. he was a crown. he was a big deal in the latin kings. >> they rented it in their names with their phone numbers, with a sun pass. they had their phones on while they were driving up there. essentially, they just wrote a map for the cops. >> investigators were able to later use cell phone tower pings to show when phone calls were made from sigfredo garcia. >> they place garcia near dan markel's neighborhood at about the time of the homicide using the cell phone data. >> we also have the atm video where, on the day of the homicide, the two killers are seen driving through an atm in that pine mica prius. >> the police had a substantial amount of information to begin collecting a warrant to arrest these guys. >> police think they've figured out who committed the murder and how they did it, but they're left with the question of why? >> why would someone commit